op chicago



R. D. KING.

LOCK GUARD APPLICATION'HLED MAYB. 191s.

Patented July 22, 1919.

imam

IRO Y D. KING, OF CHICAGO, ILLINOIS, ASSIGNOR TO COIN CONTROLLED LOCK COMPANY,

- OF CHICAGO, ILLINOIS, A CORPORATION OF CALIFORNIA.

LOCK-GUARD.

Specification of Letters Patent.

Original application filed June 2, 1916, Serial No. 101,212. Divided and this application filed Ray 8, 1918.

Serial No. 233,81.

- To all whom it may concern:

cago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Lock-Guards, of which the following is aspecification.

.This invention, a division of my applica tion Serial No. 101,212, filed June 2, 1916 for improvements in coin controlled locks, relates to means for preventing accidental unlocking of 'a lock until the-key has been 7 t on which the'parts assume after'thekey withdrawn and reinserted in the lock.

My improvements, generally applicable to cylinder or tumbler locks, areat present exemplified in a coin-controlled lock of the character described in my application mentioned above. These locks are used on parcel lockers and in similar places where it is necessary to deposit a coin in the lock before the same can be operated, the key being withdrawn and carried by the user as his check until such time as he desires toreopen the locker or container. v

It sometimes happens in looks of this general character that the user after looking the lock will, before removing the key, accidentally unlock it again. Since the coin which was'utilized to effect the locking of the lock has been ejected at'the completion of the locking-movement, it is obvious'that the use of this coin has been lost and the customer must deposit another coin in order to lock it again. With a'view to obviating this difliculty and insuring the user against the loss of his coin by accidental unlocking of the lock, I have provided as the primary 1 object of my invention, an improved foolproof device, which prevents unlocking, of

the lock untilthe key has been withdrawn and re-inse'rted therein. I have also aimed to provide a device of this character comprising but very few parts designed so that they may be compactly arranged ina lock and will positivgtlly and effectually serve the purposes de- S11 Other objects and. attendant advantages of my invention will be readily appreciated as the same'is betterunderstood by reference to the following description whenconsidered in connection with the accompanyin drawings, in which igure 1 is a rear elevation-of a lock embodying my invention, showing the parts in normal unlocked position and omitting the coin-controlled mechanism described and claimed in my application mentioned above; Fig. 2, a' sectional view taken substantially on the line 22 of Fig. 1;

Fig. 3, a rear elevation of the lock with the key cylinder moved to locked position, certain of the partsbeing removed or broken away to more clearly show the parts behind; and

Fig. 4, a similar view showing'the posi- M has been withdrawn-and re-inserted.

Since this application pertains simply to the means for preventingunlocking of the.

lock until after the key has. been withdrawn and re-inserted, I have illustrated in the draw ngs and will describe the construction of the present invention. The parts which may be of any suitable or preferred construction comprises a front or case designated generally by reference, character 5, to the rear face of which is suitably secured a housing 'or frame 6 forming a bearing suposcillating the key cylinder in a counter clockwise direction-the locking-bolt will be projected as shown in Fig. 3, and the lock locked by the action of the tumblers.

My improved device for preventing unlocking of the lock until the key has been withdrawn and re-inserted, comprises "generally speaking, a pawl adapted, under certain conditions, to engage with an abutment carried bythe key cylinder and prevent unlocking movement of the same. This pawl, which is designated generally by reference character 14, comprises a body portion provided with an elongated slot 15, a tail portion 16, and a finger or beveled end 17 adaptand operation of: only such parts of a lock 11s are necessary for a clear understanding ed to engage with an abutment or'shoulder 18 carried by an arm 19 rigidly'attached to the key-cylinder. The pawl is mounted upon a pin 21 which extends through-the slot 15 so that the pawl is pivotally supported upon .said pin and is also slida'ble relatively thereto. When the lock is in unlocked position the pawl is normally held in the position shown in Fig. 1 by a small spring 22 coiled a counter-clockwise direction, viewing this figure, and after the deposit of a coin, as explained in my application mentioned above, the shank of the key engages the tail 16 and moves the awl on its pivot intothe position. shown in ull lines in Fig. 3, in which position the end 17 is disposed beneath the a'butvment 18 so that reverse rotation of the key-- cylinder is prevented. The lock cannot be directly across the key-wa' a l unlocked until the key has been Withdrawn and .re-insertedto release the pawl. When the key is withdrawn the pawl will be rocked on its pivot by the spring 22 into the position shown in dotted lines in Fig. 3, the end 17 of the pawl being now in the path of the auxiliary abutment 25 formed integral with the arm 19, so that the pawl and this abutment act, in addition to the tumblers, as a .preventive against unlocking the look. .This construction insures a complete stroke upon the locking movement before the unlock ng movement can take place. 'It' will be observed from the po 'tion of the pawl 14, shown in dotted line in 3, that when the key has been withdrawn the tail 16 lies opening so, that it will be engaged by the ey when it is inserted. The re-insertion of the key therefore lifts the. pawl frdni the position shown in dotted lines in Fi 3 to the position shown in Fig. 4,v there y withdrawing the end 17 from the path of travel ofthe abutment 25 so that the lock can be turned to erative position by the insertion ofa key in said cylinder. v

' 2. In a lock, the combination of a keycylinder provided with a laterally projecting abutment, and means including a pivot- .ally mounted pawl disposed transversely of said cylinder for engaging said abutment to retain said cylinder in locked position be fore the key is withdrawn, said means being adapted to be released from said abutment by the insertion of a key in said cylinder.

3. In a lock, the combination of a. keyeylinder provided with an abutment, a fixed pivot pin, a pawl pivotally and slidingly mounted upon said pin, and a spring acting on said pawl to normally maintain the same in inoperative position, said 'pawl being movable into cooperative relation with said abutment by a key in said cylinder when the cylinder is turned to locked position and be-- ing movable out of cooperative relation with said pawl by said key when the key is reinserted in the cylinder.

4. In a lock, the combination of a key-p cylinder having a part adapted 'to I be engaged to prevent unlocking movement of the cylinder, and a member normally disposed .in the path of movement of a key inserted win. the cylinder and adapted to be moved by.

thekey uponrotation thereof,"into engagement with saidcylinder part so as to prevent unlocking movement of'said cylinder.

5. Ina lock, the combination'of a keycylinder having a part adapted to "be en: gaged for preventing unlocking movement of the cylinder, and amember normally disposed in the path of a keyinserted inthe cylinder and adapted to be moved by the key upon locking movement thereofso as to enunlocked position, whereupon the pawl willagage mgid cylinder part and prevent unlockreassume its original position, .as shown in Fig. 1.

It is believed that invention, its mode of operation and many of its advantages will be understood from the foregoingwithout further description, but it should be obvious combination of a key adapts to be moved by the key' upon re-lnsertion of the same in the cylinder out of said engagement w1th thecylinder part.

ement thereof, said member being 6. In a lock, the combination of a key- 7 cylinder, a; pivotally'mounted pawl adapted to be movedby a key in the cylinder into position to prevent locking. movement of the cylinder, the pawl remaining in operative position when the key has been withdrawn from the cylinder and being adapted to be movedby re-insertion of thekey in the cylinderto an inoperative position.

7 7. In a lock, the cnmhination' of a .keycylinder, a pivotallymounted pawl adapted to engage with said cylinder to prevent unlocking movement thereof, and a spri act- 5 ing on said pawl, said pawl comprising a portion disposed in the path of movement of v a key inserted in said cylinder so that said pawl is moved against the force of said spring 'into locking position with relation to the cylinder by the key during its rotative 10 movement to lock the lock, said pawl being adapted to be released by longitudinal movement of the key upon re-insertion into the cylinder.

ROY D. KING. 

